3PCS Cast Steel Trunnion Mounted Ball Valve

3PCS Cast Steel Trunnion Mounted Ball Valve – Comprehensive Overview

A 3PCS cast steel trunnion mounted ball valve is a heavy-duty isolation valve designed for high-pressure and high-temperature service in critical industrial applications. The “3PCS” designation refers to its three-piece bolted body construction—two end caps and a central body section—which allows for inline maintenance and easier replacement of internal components without removing the entire valve from the pipeline.

The trunnion-mounted design supports the ball from both the top and bottom, reducing operational torque and seat wear, while the cast steel body offers strength, manufacturing flexibility, and cost-effectiveness for large-size valves.

Typical Operating Conditions

3PCS cast steel trunnion mounted ball valves are widely used in:

• Oil & Gas Transmission and Distribution – Providing secure shutoff in crude oil, refined products, and natural gas pipelines.

• Offshore Platforms and Subsea Installations – Handling extreme pressure, corrosive seawater, and tight installation spaces.

• Petrochemical and Refining Units – Managing high-temperature and high-pressure process streams in catalytic cracking, hydrocracking, and distillation plants.

• Power Generation – Controlling high-pressure steam, feedwater, and cooling systems.

• Cryogenic Service – Configurable for LNG and low-temperature gases with special trims and seals.

Material Selection and Performance Impact

• WCB/WCC Cast Carbon Steel – A cost-effective choice for non-corrosive, high-pressure service.

• LCB/LCC Low-Temperature Carbon Steel – Maintains toughness at sub-zero temperatures for cryogenic and cold-climate applications.

• CF8/CF8M Stainless Steel – Superior corrosion resistance for chemical, wet gas, and marine environments.

• Duplex Stainless Steel – Combines high strength with excellent resistance to chloride stress corrosion cracking, ideal for offshore use.

Cast steel construction provides manufacturing flexibility for large diameters, while modern casting technology ensures consistent mechanical properties and high structural integrity.

Types and Configurations

• Side Entry 3PCS Design – Commonly used, with bolted connections for easier disassembly and internal inspection.

• Fully Welded Center Section – For underground or subsea service where leak prevention is critical.

• Soft-Seated and Metal-Seated Options – Adaptable to clean service or high-temperature, abrasive conditions.

• Manual, Gear, Pneumatic, or Electric Actuation – Configurable to match process control requirements.

Advantages of 3PCS Cast Steel Trunnion Mounted Ball Valves

• Inline Maintenance Capability – Allows internal servicing without full removal from the pipeline.

• Reduced Torque Requirements – Trunnion-mounted design minimizes seat friction for smoother operation.

• High Safety Integrity – Designed to meet fire-safe, anti-static, and anti-blowout stem standards.

• Wide Application Range – Suitable for ANSI Class 150 to 2500 pressure ratings and various industrial services.

A 3PCS cast steel trunnion mounted ball valve offers exceptional maintainability, operational safety, and mechanical reliability. With the right material and seat configuration, it is well-suited for the toughest environments—from deepwater offshore facilities to cryogenic LNG terminals—while delivering long service life and low total cost of ownership.